strong-tie/inbound-calls

1'use strict';2 3// do not edit .js files directly - edit src/index.jst4 5 6 7module.exports = function equal(a, b) {8  if (a === b) return true;9 10  if (a && b && typeof a == 'object' && typeof b == 'object') {11    if (a.constructor !== b.constructor) return false;12 13    var length, i, keys;14    if (Array.isArray(a)) {15      length = a.length;16      if (length != b.length) return false;17      for (i = length; i-- !== 0;)18        if (!equal(a[i], b[i])) return false;19      return true;20    }21 22 23 24    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;25    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();26    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();27 28    keys = Object.keys(a);29    length = keys.length;30    if (length !== Object.keys(b).length) return false;31 32    for (i = length; i-- !== 0;)33      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;34 35    for (i = length; i-- !== 0;) {36      var key = keys[i];37 38      if (!equal(a[key], b[key])) return false;39    }40 41    return true;42  }43 44  // true if both NaN, false otherwise45  return a!==a && b!==b;46};47